264 lines
14 KiB
JSON
264 lines
14 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-97931",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2026-09-25T10:18:58.203Z",
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"datePublished": "2026-09-25T10:22:47.382Z",
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"dateUpdated": "2026-10-19T09:10:58.123Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-10-19T09:10:58.123Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: us122l: Prevent write upgrades for read mappings\n\nThe hwdep mmap callback rejects read-buffer mappings that are initially\nwritable, but leaves VM_MAYWRITE set on mappings created with PROT_READ.\nA process that can open the hwdep node O_RDWR can later use mprotect() to\nmake the mapping writable.\n\nThe read allocation begins with struct usb_stream. Its read_size member is\nused by the fault handler to decide which pages belong to the read buffer.\nThe read VMA intentionally remains expandable because pcm_usb_stream uses\nmremap() after reading that size. Changing read_size first can therefore\nmap and access pages beyond the allocation. The same member is also\nconsumed by usb_stream_free(), where changing it can make\nfree_pages_exact() release pages outside the allocation.\n\nClear VM_MAYWRITE for read-buffer mappings after rejecting an initially\nwritable VMA. This keeps the separate output-buffer mapping writable while\npreventing later permission upgrades."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"value": "AV:L - The bad data is written by a local process. It maps the us122l hwdep read buffer PROT_READ via usb_stream_hwdep_mmap(), upgrades it with mprotect() because VM_MAYWRITE was never cleared, and overwrites usb_stream.read_size. No remote protocol or USB packet carries the malicious value.\nAC:H - The driver only binds, and only creates /dev/snd/hwC*D*, when a TASCAM US-122L/US-144 is attached. A local attacker can't produce that hardware without physical access. Once it is present, mmap, mprotect, a read_size overwrite and mremap are fully deterministic.\nPR:L - The attacker needs an O_RDWR open of the hwdep node, which a normal user gets through audio group or seat uaccess ACLs. usb_stream_hwdep_open() and usb_stream_hwdep_ioctl() do no capability checks, and the stream already exists from probe.\nUI:N - The attacker's own process does the open, mmap, mprotect, write to read_size, mremap and page faults. No other user has to act.\nS:U - The result is corrupted kernel memory and local privilege escalation within the same kernel authority. No VM or hardware isolation boundary is crossed.\nC:H - With an inflated read_size, usb_stream_hwdep_vm_fault() maps virt_to_page((char *)s + offset) for offsets past the alloc_pages_exact() buffer. Userspace can then directly read arbitrary adjacent kernel pages.\nI:H - Those out-of-bounds pages are mapped writable into userspace, giving direct write access to kernel memory. In addition, usb_stream_free() calls free_pages_exact(s, read_size) with the tampered size, freeing pages that are still in use, a page-level use-after-free.\nA:H - Writing to foreign kernel pages, or freeing the wrong pages through usb_stream_free() on SET_PARAMS re-init or disconnect, corrupts the page allocator and kernel data, which leads to an oops or panic."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"sound/usb/usx2y/us122l.c"
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],
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"versions": [
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{
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"version": "030a07e441296c372f946cd4065b5d831d8dc40c",
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"lessThan": "cbc1f954ce67d739d41d1f0757d29850353ebb6a",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "030a07e441296c372f946cd4065b5d831d8dc40c",
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"lessThan": "becb89036a1320ef0a77da2d27935ac0704345c4",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "030a07e441296c372f946cd4065b5d831d8dc40c",
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"lessThan": "6a5f5a5a32c78e67701f1d0f26bc87af68895604",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "030a07e441296c372f946cd4065b5d831d8dc40c",
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"lessThan": "938e8d6cee8d36f24669dfdcd3717e081eb32d64",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "030a07e441296c372f946cd4065b5d831d8dc40c",
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"lessThan": "64a87950239867682cde128020e1a47088295e5c",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "030a07e441296c372f946cd4065b5d831d8dc40c",
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"lessThan": "d9c537b14f4982f17b103e3a2cfeee4bee6bc026",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "030a07e441296c372f946cd4065b5d831d8dc40c",
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"lessThan": "0eb9dd4774af0ac4d1fd105ef2b0a1f6cec06f2f",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "030a07e441296c372f946cd4065b5d831d8dc40c",
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"lessThan": "71c610aeb1770302ac9c9e0b9a4ecd37f1311928",
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"status": "affected",
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"versionType": "git"
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"sound/usb/usx2y/us122l.c"
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],
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"versions": [
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{
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"version": "2.6.28",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "2.6.28",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.10.271",
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"lessThanOrEqual": "5.10.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.15.222",
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"lessThanOrEqual": "5.15.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.1.189",
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"lessThanOrEqual": "6.1.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.6.158",
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"lessThanOrEqual": "6.6.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.12.111",
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"lessThanOrEqual": "6.12.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.18.53",
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"lessThanOrEqual": "6.18.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.2.7",
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"lessThanOrEqual": "7.2.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.3",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"cpeApplicability": [
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{
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "2.6.28",
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"versionEndExcluding": "5.10.271"
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]
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/cbc1f954ce67d739d41d1f0757d29850353ebb6a"
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},
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{
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"url": "https://git.kernel.org/stable/c/becb89036a1320ef0a77da2d27935ac0704345c4"
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},
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{
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"url": "https://git.kernel.org/stable/c/6a5f5a5a32c78e67701f1d0f26bc87af68895604"
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},
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{
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"url": "https://git.kernel.org/stable/c/938e8d6cee8d36f24669dfdcd3717e081eb32d64"
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},
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{
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"url": "https://git.kernel.org/stable/c/64a87950239867682cde128020e1a47088295e5c"
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},
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{
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"url": "https://git.kernel.org/stable/c/d9c537b14f4982f17b103e3a2cfeee4bee6bc026"
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},
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{
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"url": "https://git.kernel.org/stable/c/0eb9dd4774af0ac4d1fd105ef2b0a1f6cec06f2f"
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},
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{
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"url": "https://git.kernel.org/stable/c/71c610aeb1770302ac9c9e0b9a4ecd37f1311928"
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}
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],
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"title": "ALSA: us122l: Prevent write upgrades for read mappings",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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}
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}
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} |